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Re: [PATCH v2 16/39] xen/riscv: extend exception tables with type and data fields
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>
- Date: Tue, 08 Sep 2026 10:18:44 +0200
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- Cc: Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Romain Caritey <Romain.Caritey@xxxxxxxxxxxxx>, Zheng Zhang <zhangzheng@xxxxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
- Delivery-date: Tue, 08 Sep 2026 08:19:15 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 2026-09-08 08:06:29+02:00, Jan Beulich wrote:
> On 07.09.2026 17:57, Baptiste Le Duc wrote:
>
> >> --- a/xen/arch/riscv/include/asm/processor.h
> > Comment claims ->zero "must always read as 0" as it's hard-wired to zero
> > by the HW, but nothing enforces that, it's still a plain writable
> > unsigned long. Maybe a write-side counterpart that special-cases num==0
> > as a no-op, or with a minimum ASSERT(num != 0) / BUG_ON(num == 0) to
> > anticipate any future forbidden writes.
>
> With polarity inverted, though.
Yes sorry, it should be ASSERT(num == 0) / BUG_ON(num != 0)
>
> Jan
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